/**
 * Copyright 2010-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.mybatis.spring.transaction;

import java.sql.Connection;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.session.TransactionIsolationLevel;
import org.apache.ibatis.transaction.Transaction;
import org.apache.ibatis.transaction.TransactionFactory;

/**
 * Creates a {@code SpringManagedTransaction}.
 *
 * @author Hunter Presnall
 *
 * 为了让Spirng管理mybatis的事务，创建的事务工厂
 */
public class SpringManagedTransactionFactory implements TransactionFactory {
  @Override
  public Transaction newTransaction(DataSource dataSource, TransactionIsolationLevel level, boolean autoCommit) {
    //创建的事务是SpringManagedTransaction，这里只和传进来的dataSource参数有关。
    return new SpringManagedTransaction(dataSource);
  }
  @Override
  public Transaction newTransaction(Connection conn) {//不支持直接根据连接创建事务。
    throw new UnsupportedOperationException("New Spring transactions require a DataSource");
  }
  @Override
  public void setProperties(Properties props) {
    // not needed in this version
  }
}
